As it would be difficult to write everything man knows about snails, I have added related links to help obtain as much useful information I feel one would generally want to know about snails. Please check related links below for more information.
Yes do all snails surface to breathe?
Some snails can self-fertilize, such as Helix aspersa, but not all snails can.
No, not all snails can live underwater. Some snails are adapted to live in water, while others live on land.
Not all snails live in water. Some snails can survive on land as well.
All snails that I know of eat algae.
all snails sleep in gardens because it is comfortable.
Apple snails are freshwater aquatic snails. Garden snails are land snails.Apple snails have lungs and gillsGarden snails have lungs onlyApple snails skin is thin and translucent (with slime)Garden snails skin is thick and leathery (with slime)All apple snails have two sets of antennaeGarden snails have species with one and two sets.
Giant African Land Snails (or GALS) get much, much bigger. Garden snails are legal to have in the USA but it is illegal to keep GALS in the USA. GALS serves as a major crop problem but most all Snails (if not all snails) make great pets!
all snails have both male and female parts
Yes, all snails are born with a shell.
Not all snails can live in water. Some species of snails require a different habitat, such as land or freshwater environments.
All of them.